Re: Handling page refresh or redirect when the server reboots

2014-10-31 Thread msalman
myproject.zip
http://apache-wicket.1842946.n4.nabble.com/file/n4668210/myproject.zip  


I finally got it working.  And just in case some one needs to do something
similar I am attaching the proof of concept project.  Any feedback would be
highly appreciated.  

Thanks to Sebastian and Martin for their inputs.

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Re: Handling page refresh or redirect when the server reboots

2014-10-21 Thread Martin Grigorov
Hi,

HttpXmlRequest is asynchronous by default.
It is not finished by the time you return from your function.

Martin Grigorov
Wicket Training and Consulting
https://twitter.com/mtgrigorov

On Tue, Oct 21, 2014 at 8:37 AM, msalman mohammad_sal...@yahoo.com wrote:

 Sebastian, thanks for your response and idea.


 Taking your idea  myproject.zip
 http://apache-wicket.1842946.n4.nabble.com/file/n4667990/myproject.zip
 I
 am trying to use the following javascript code in wicket:



 Http.Get = function(theUrl)
 {
 var xmlHttp = null;
 try
 {
 xmlHttp = new XMLHttpRequest();
 return xmlHttp.open(GET, theUrl, true );
 xmlHttp.send();
 return xmlHttp.statusText;
 //return xmlHttp.responseText;
 }
 catch (error)
 {
 return 'error in my code: ' + error;
 }
 }


 The above code is called via:

 add(new AjaxLink(link)
 {


 @Override
 public void onClick(AjaxRequestTarget target)
 {
 target.add(testLabel);
 }


 @Override
 protected IAjaxCallDecorator getAjaxCallDecorator()
 {
 return new IAjaxCallDecorator()
 {
 private static final long
 serialVersionUID = 1L;

 public CharSequence decorateScript(
 Component component,
 CharSequence script)
 {
 return
 document.getElementById('testlabel').innerHTML = 'plain '  +
 Http.Get('http://www.cnn.com') ; + script;
 }


 public CharSequence
 decorateOnSuccessScript(
 Component component,
 CharSequence script)
 {
 return
 document.getElementById('testlabel').innerHTML = 'on success '
 + Http.Get('http://www.cnn.com') ; + script;
 }


 public CharSequence
 decorateOnFailureScript(
 Component component,
 CharSequence script)
 {
 return
 document.getElementById('testlabel').innerHTML = 'on Failure '
 +  Http.Get('http://www.cnn.com') ; + script;
 }
 };
 }

 });


 The problem is that when I use it in wicket the xmlHttp.statusText or
 xmlHttp.responseText returns nothing.
 Can any one please tell me what I might be doing wrong?
 Does the code or calling it even makes sense?

 I am attaching  quickstart project.  Please see:
 com.mytest.javascript.*


 Thanks.



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Re: Handling page refresh or redirect when the server reboots

2014-10-20 Thread msalman
Sebastian, thanks for your response and idea.


Taking your idea  myproject.zip
http://apache-wicket.1842946.n4.nabble.com/file/n4667990/myproject.zip  I
am trying to use the following javascript code in wicket: 



Http.Get = function(theUrl)
{
var xmlHttp = null;
try
{
xmlHttp = new XMLHttpRequest();
return xmlHttp.open(GET, theUrl, true );
xmlHttp.send();
return xmlHttp.statusText;
//return xmlHttp.responseText;
}
catch (error)
{
return 'error in my code: ' + error;
}
}


The above code is called via:

add(new AjaxLink(link)
{


@Override
public void onClick(AjaxRequestTarget target) 
{
target.add(testLabel);  
}


@Override
protected IAjaxCallDecorator getAjaxCallDecorator()
{
return new IAjaxCallDecorator()
{
private static final long 
serialVersionUID = 1L;

public CharSequence decorateScript(
Component component,
CharSequence script) 
{
return 
document.getElementById('testlabel').innerHTML = 'plain '  +
Http.Get('http://www.cnn.com') ; + script;
}


public CharSequence 
decorateOnSuccessScript(
Component component, 
CharSequence script) 
{
return 
document.getElementById('testlabel').innerHTML = 'on success '
+ Http.Get('http://www.cnn.com') ; + script;
}


public CharSequence 
decorateOnFailureScript(
Component component, 
CharSequence script) 
{
return 
document.getElementById('testlabel').innerHTML = 'on Failure '
+  Http.Get('http://www.cnn.com') ; + script;
}
};
}

});


The problem is that when I use it in wicket the xmlHttp.statusText or
xmlHttp.responseText returns nothing.  
Can any one please tell me what I might be doing wrong? 
Does the code or calling it even makes sense?

I am attaching  quickstart project.  Please see:
com.mytest.javascript.*


Thanks.



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Re: Handling page refresh or redirect when the server reboots

2014-09-16 Thread S├ębastien Gautrin

I don't have a wicket-way for this. However, if I had to do something like 
that, I'd try the following simple and extremely basic approach (which would need to be 
refined to be more than just an ugly hack)

1. after the action triggering the upgrade process, trigger a javascript on the 
client side
2. this javascript would poll a given url (e.g. current page or application 
home or a specific bookmarkmable page, the latter being probably better)
1. as long as the polled url does not return (within a short timeout) or 
returns an error code (depending on your setup: if the app is behind a proxy, 
you'd expect a 502/503 error as long as the app is not up)
2. once the poll returns a non-error, the javascript would trigger the 
redirect (it could also probably trigger a modal login form on the current page 
instead)

Note that I myself feel this approach would be very hacky and is most likely 
not the best way to do it with wicket, but this should at least work for your 
purpose, and maybe give you an idea on how to do it better.

On 10/09/14 23:03, msalman wrote:

So we have this feature of online server upgrade in which the user can start
an upgrade on the server while still logged into the (wicket) web app.  This
starts some scripts in the bacground which bring the  jboss server down,
upgrade the db, upgrade the ear file, etc., and then restart the jboss
server.  When the server comes back up we would like the user to be
redirected to the login page of the app automatically.  The last part does
not work.  At this time we just have a message telling the user to refresh
the page and when everything is ready he will be sent to the login page.

Is there a good robust way to make sure that the page is automatically
refreshed and the login page is presented?  Is it even possible to do it?
Personally I don't think this is not a good idea but this feature is a
requirement and I want to explore it as much as possible.


Appreciate any help.

Thanks.


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Handling page refresh or redirect when the server reboots

2014-09-10 Thread msalman
So we have this feature of online server upgrade in which the user can start
an upgrade on the server while still logged into the (wicket) web app.  This
starts some scripts in the bacground which bring the  jboss server down,
upgrade the db, upgrade the ear file, etc., and then restart the jboss
server.  When the server comes back up we would like the user to be
redirected to the login page of the app automatically.  The last part does
not work.  At this time we just have a message telling the user to refresh
the page and when everything is ready he will be sent to the login page.

Is there a good robust way to make sure that the page is automatically
refreshed and the login page is presented?  Is it even possible to do it? 
Personally I don't think this is not a good idea but this feature is a
requirement and I want to explore it as much as possible.


Appreciate any help.

Thanks.


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http://apache-wicket.1842946.n4.nabble.com/Handling-page-refresh-or-redirect-when-the-server-reboots-tp4667465.html
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